TM10-3930-660-20 18-28. HYDRAULIC OIL SAMPLING VALVE - REPLACE This task covers: a. Removal b. Installation Initial Setup Tools Materials/Parts Tool Kit, Automotive Mechanics Loctite 59241 Cap and Plug Set (APP. C, Item 42) Equipment  Condition Engine OFF and cool. Transmission cover removed para.  16-6. REMOVAL WARNING Hydraulic oil in the system can be under pressures over 3000 psi with the engine OFF. ALWAYS relieve pressure in hydraulic lines before attempting to remove any component in the hydraulic system. With engine OFF, starter switch in RUN position, and MLRS attachment on the ground, move control levers through all operating positions several times to relieve line pressure. Relieve pressure in hydraulic oil tank by loosening filler cap very slowly. Failure to follow these precautions could result in serious personal injury. WARNING At operating temperatures, hydraulic oil is hot and under pressure. Hot oil can cause injuries. Allow hydraulic oil to cool before disconnecting any hydraulic lines. 1. UNSCREW HYDRAULIC OIL SAMPLING VALVE (1) FROM ELBOW (2). 18-115